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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Loss            
Total after-tax amount $ 586,795   $ 586,795   $ 560,883  
Impact on unrecognized net actuarial gain (loss)            
Change in the unrecognized net actuarial gain (loss), after tax (6,780) $ (2,595) (6,232) $ (8,072)    
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Loss            
Total pre-tax amount (38,656)   (38,656)   (31,932)  
Total after-tax amount (27,585) (18,700) (27,585) (18,700) (23,479) $ (14,912)
Unrecognized Net Periodic Benefit Costs            
Accumulated Other Comprehensive Loss            
Total pre-tax amount (34,969)   (34,969)   (30,140)  
Total after-tax amount (25,338) (18,040) (25,338) (18,040) (22,387) (14,386)
Interest Rate Swap            
Accumulated Other Comprehensive Loss            
Total pre-tax amount (1,568)   (1,568)   (576)  
Total after-tax amount (953)   (953)   (350)  
Foreign Currency Translation            
Accumulated Other Comprehensive Loss            
Total pre-tax amount (2,119)   (2,119)   (1,216)  
Total after-tax amount $ (1,294) $ (660) $ (1,294) $ (660) $ (742) $ (526)